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Global Navigation Satellite System Mapping (GNSS) Project

The Board of Water Supply (BWS) has contracted Dudek for a two-year project to locate and collect Geographic Information System (GIS) data for water system features throughout Oahu. The project will map about 46,000 features – BWS-owned valves, meters, and hydrants – using high accuracy Real Time Kinematic (RTK) Global Navigation Satellite System (GNSS) technology. Many of these features are underground in roadways and sidewalks, making them hard to find and access.

dudek gnss project

This project, contracted for $500,000, is a continuation of a previous effort from about 10 years ago. The BWS used Global Positioning Satellite technology to map most of its water system features. However, it was unable to collect data for all of them at the time and some features have since been added and/or moved.

To collect GNSS data for each feature, the contractor’s employee will:

  • Locate the feature, place an antenna pole over it for a few seconds to get GNSS positioning and record the data in a tablet before moving on to the next feature.
  • Possibly take photos if field conditions do not match BWS data.

The BWS is mailing out flyers to notify customers about a week in advance of the contractor’s work in an area. Work will take place Monday through Friday, from 7:00 AM to 4:00 PM. Water service will not be affected. The work will occur in the public right-of-way. In very rare instances when an asset is in a BWS easement within private property, someone will contact the property owner in advance to notify them that access is needed.

No customer shall be asked for any type of payment by any BWS employee or contractor for this project.

To address concerns that the project may be used to mask illegal activity:

  • All contractor employees will have special BWS Contractor ID badges.
    gnss dudek contractor badge
  • Contractor employees will carry a letter and special business cards from the BWS.
  • The BWS will post project information on its website at boardofwatersupply.com, as well as on social media – Facebook, Twitter, and Nextdoor – for customers to check on work in their area.
  • If customers spot suspicious activity or have questions about the project, they can contact the BWS via:
    • A special hotline at 748-6500 – monitored 7:45 a.m. to 4:30 p.m., Monday-Friday. IMPORTANT – If calling before 7:45 a.m. or after 4:30 p.m., please leave your name and phone number so that we may return your call.
    • Email at contactus@hbws.org - monitored 7:45 a.m. to 4:30 p.m. Monday-Friday.

Work Schedule

October 21, 2021 – See map below for planned work. Check back regularly for any last-minute updates.

Project Work Area Map

Search by zip code to see if work has been scheduled for your area. Share a map on Facebook or Twitter, or by email. Note: details posted on the map are subject to change. Please check the Work Schedule section of this page for any additional updates from the BWS Communications Office.



Updated: 10/15/2021